Microbiology: A Systems Approach 4th Edition by Marjorie Kelly Cowan

Exercise 25

Critical thinking is the ability to reason and solve problems using facts and concepts. These questions can be approached from a number of angles and, in most cases, they do not have a single correct answer.
Based on the following image:

a. Explain where the charges should be applied to this gel in order for the DNA samples to migrate properly.
b. Identify the largest DNA fragment in sample 5. Explain your selection.